Flashing check engine light turned on while driving

ROCKAWAY01

MEMBER
2013 FORD EXPEDITION
2.5L
6 CYL
4WD
AUTOMATIC
147,000 MILES

I was driving on the highway getting ready to exit, I sped up and drove around another car on a curve and my check engine light came on flashing as I rounded the curve. The flashing stopped in about 30 seconds, should I be worried about this?

Friday, February 19th, 2021 AT 9:21 AM

3 Replies

KASEKENNY

MECHANIC
18,907 POSTS

Is the check engine light still on? We should check for codes and go from there.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Once we know what codes are there, we will have a better idea. However a flashing check engine light normally means it is a misfire that is potentially damaging the engine or exhaust. So we need to find out if this is the case. Even if the light is off, there will still be a stored code.

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

So if the light is still on then we need to check this and go from there. Lastly are there any issues with the way it drives? Does it feel rough or sluggish?

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Friday, February 19th, 2021 AT 4:08 PM

ROCKAWAY01

MEMBER
2 POSTS

The engine light has not come back on but the car does drive sluggishly. I used a diagnostic scanner for AutoZone and the code PO305 came up.

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Monday, February 22nd, 2021 AT 10:28 PM

KASEKENNY

MECHANIC
18,907 POSTS

Okay. This could be a number of things causing the misfire but let's run a compression check on all cylinders because if that is not ok then nothing else matters.

Here are guides that help with this:

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

https://www.2carpros.com/articles/how-to-test-engine-compression

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Tuesday, February 23rd, 2021 AT 6:45 PM